Hi Schwertbruder,What you heard regarding Osprey is only true regardijng certain artists - some are very good about research, and have a lot of knowledge about the field they are illustrating, and others are not,
Fortunaterly for you, Gerry Embleton was the artist forn the English Archer book, and he has almost two decades under his belt researching 15th century artifacts, so it is more reliable than most Osprey books. Angus MacBride is a great artist, but his artwork is no where near as well researched, and usually has blatant sins in it.
Gerry founded the famous "Company of Saynte George", which photos fill "The Medieval Soldier" (Along with "The WHite Company", and "1476".
As a general rule - always use primary research as a basis for any reconstruction. That said, the particular title "The English Longbowman" is far more reliable than you have been led to believe.
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Bob R.